If your EV is a lease car then you could favour testing battery degredation over the 3 years by “treating it like you stole it” so we can really know the answer.
I’ll be just using it “as I see fit”, which for me means an occasional balance charge overnight from the mains electric at home (I did one last night), and using rapid & ultra rapid chargers as needed on any journeys I fancy undertaking.
Now, I also know that in winter the battery on the Peugeot e-2008 suffers a bit from “cold-gating” which means that when you plug into an ultra rapid charger you’ll charge at a lesser speed than expected, so, the solution is to “yo-yo” a bit before you arrive at the charger (so expect to see PSA group EVs speeding up rapidly & slowing down a few times before they charge simply to warm up the battery pack). The PSA batteries are supposed to manage the heat of the battery but PSA have got the equations wrong by a small amount & we’re awaiting a potential software fix so our batteries don’t over-cool in winter (this could also help with winter range but don’t bet on that).
Now for those lucky enough to run a Leaf, the opposite is true, the car will “rapid-gate” as the air cooled battery overheats in summer and on long journeys the car will limit the charging speed to try to stop the heat destroying the battery.
Tesla have spent years solving these battery issues, & the other fossil manufacturers who sell a few EV haven’t bothered, I don’t think it is Motability customers duty to change the way we use these cars just because Motability favours EU manufactered cars over the Teslas & Kia/Hyundais, it’s between Motability & the manufacturers to provide cars with adequate battery management or replace batteries as necessary when they fail.